Annual report pursuant to Section 13 and 15(d)

Proforma Results of Operations (Detail)

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Proforma Results of Operations (Detail) (USD $)
In Thousands, except Per Share data, unless otherwise specified
3 Months Ended 12 Months Ended
Aug. 31, 2012
May 31, 2012
Feb. 29, 2012
Nov. 30, 2011
Aug. 31, 2011
May 31, 2011
Feb. 28, 2011
Nov. 30, 2010
Aug. 31, 2012
Aug. 31, 2011
Aug. 31, 2010
Business Acquisition, Pro Forma Information [Line Items]                      
Net sales, As reported $ 405,304 $ 429,215 $ 378,024 $ 392,799 $ 403,436 $ 392,777 $ 330,698 $ 318,412 $ 1,605,342 $ 1,445,323 $ 1,160,508
Net sales, Pro forma                 1,660,829 1,642,124 1,430,850
Earnings from continuing operations, As reported         37,333 38,360 22,142 26,661 87,290 124,496 70,356
Earnings from continuing operations, Pro forma                 $ 93,555 $ 138,945 $ 80,272
Basic earnings per share from continuing operations, As reported         $ 0.55 $ 0.56 $ 0.32 $ 0.39 $ 1.25 $ 1.82 $ 1.04
Basic earnings per share from continuing operations, Pro forma                 $ 1.33 $ 2.04 $ 1.19
Diluted earnings per share from continuing operations, As reported         $ 0.50 $ 0.51 $ 0.30 $ 0.36 $ 1.17 $ 1.68 $ 0.97
Diluted earnings per share from continuing operations, Pro forma                 $ 1.25 $ 1.87 $ 1.11